Glee star Matthew Morrison has confirmed that some cast members will not return for season four.

However, the actor told The Washington Post that he has "no idea" which stars will exit the Fox musical.

"I mean, the show's back next season, but we don't even know which cast members will actually be back," he explained.

"I think I'll be back, but some of the kids... we're trying to figure out what we're going to do with that."

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Morrison - who plays Will Schuester - added that the departures will be handled "very sensitively".

"For a lot of these kids, it will be their last show," he said. "I'm really happy that they're treating it with such sensitivity and making the stories so great to end the show for some of these people."